If you’ve opened a bottle of Advil or Tylenol in the last few decades you know how much of a pain it can be.
First there’s the safety cap, then the wad of cotton, and they’re all kept underneath a child-proof lock that’s tough for most adults to open.
But none of those safety precautions existed when the Tylenol Murderer terrorized the country.
The string of killings baffle detectives to this day, and the man behind them could still be on the loose.
It all started when 12-year-old Mary Kellerman from Chicago told her parents she had a cold. They gave her Tylenol, and just minutes later the young girl collapsed.
Within hours, Kellerman was dead. But she was only the first victim in a string of deaths across Chicago in 1982.
Six more victims soon died under similar circumstances.
One victim was a mother of four. One was a flight attendant.
The only thing connecting their cases were Tylenol pills, taken shortly before death.
In one family, three victims died one after another after taking pills from the same bottle: first one man, then his brother, then the brother's wife.
Once police identified the connections they began to trace back the poisoned pills.
Each bottle of pills had been laced with an enormous dose of potassium cyanide, enough to kill thousands of people each.
An investigator from Cook County's medical examiner's office remembered opening one of the fatal bottles:
"Nothing looked out of the ordinary. However, as I was pouring them out of the bottles, I could tell there was a strong smell of almonds."
An investigation revealed that the bottles had been sold at different stores and manufactured at different plants.
It seemed the poisoner had taken the bottles, tampered with them, then replaced them on store shelves across Chicago.
Johnson & Johnson, the makers of Tylenol, began a massive nationwide recall.
Hospitals were warned to stop using Tylenol, and 31 million bottles - worth over $100 million - were recalled.
But the investigation into the poisonings stalled. Police found three more tampered bottles, but no clues leading to the murderer.
But while this case is still unsolved, there are a number of famous suspects - including a convicted terrorist.